diff options
author | Qu Wenruo <wqu@suse.com> | 2021-08-17 17:38:51 +0800 |
---|---|---|
committer | David Sterba <dsterba@suse.com> | 2021-10-25 21:17:16 +0200 |
commit | 8481dd80ab1eccbe04334269d668b467e9dfa788 (patch) | |
tree | cfbfad160a92a8768ca58a918e2ff7ba2a8fff37 /fs/btrfs/disk-io.c | |
parent | 651fb419273300ebad459630becd839d79439bbc (diff) |
btrfs: subpage: introduce btrfs_subpage_bitmap_info
Currently we use fixed size u16 bitmap for subpage bitmap. This is fine
for 4K sectorsize with 64K page size.
But for 4K sectorsize and larger page size, the bitmap is too small,
while for smaller page size like 16K, u16 bitmaps waste too much space.
Here we introduce a new helper structure, btrfs_subpage_bitmap_info, to
record the proper bitmap size, and where each bitmap should start at.
By this, we can later compact all subpage bitmaps into one u32 bitmap.
This patch is the first step.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r-- | fs/btrfs/disk-io.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 355ea88d5c5f..71aafe9606e0 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1644,6 +1644,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info) btrfs_extent_buffer_leak_debug_check(fs_info); kfree(fs_info->super_copy); kfree(fs_info->super_for_commit); + kfree(fs_info->subpage_info); kvfree(fs_info); } @@ -3392,12 +3393,12 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device goto fail_alloc; } - if (sectorsize != PAGE_SIZE) { + if (sectorsize < PAGE_SIZE) { + struct btrfs_subpage_info *subpage_info; + btrfs_warn(fs_info, "read-write for sector size %u with page size %lu is experimental", sectorsize, PAGE_SIZE); - } - if (sectorsize != PAGE_SIZE) { if (btrfs_super_incompat_flags(fs_info->super_copy) & BTRFS_FEATURE_INCOMPAT_RAID56) { btrfs_err(fs_info, @@ -3406,6 +3407,11 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device err = -EINVAL; goto fail_alloc; } + subpage_info = kzalloc(sizeof(*subpage_info), GFP_KERNEL); + if (!subpage_info) + goto fail_alloc; + btrfs_init_subpage_info(subpage_info, sectorsize); + fs_info->subpage_info = subpage_info; } ret = btrfs_init_workqueues(fs_info, fs_devices); |